Trubleshooting Audio Reverberation Issues
Reverberation of the audio is caused by someone who is broadcasting having their mic in earshot of the broadcast playing on another device, browser or even through a phone.
The easy way to identify who is at fault, is to have the individual panelists come off the broadcast and as soon as the reverberation goes, you will know who needs to check that no other browsers, phones or playback devices are on.
With some older systems it can also create reverb by just using the in-built mic and speakers - the best solution is for headsets to be used - this will dramatically improve the audio quality for all.